A numerical approach to determine the sufficiency of given boundary data sets for uniquely estimating interior elastic properties

Reddy, Narayana A and Ananthasuresh, GK (2012) A numerical approach to determine the sufficiency of given boundary data sets for uniquely estimating interior elastic properties. In: Inverse Problems in Science and Engineering, 20 (7). pp. 1057-1077.

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Abstract

We consider an inverse elasticity problem in which forces and displacements are known on the boundary and the material property distribution inside the body is to be found. In other words, we need to estimate the distribution of constitutive properties using the finite boundary data sets. Uniqueness of the solution to this problem is proved in the literature only under certain assumptions for a given complete Dirichlet-to-Neumann map. Another complication in the numerical solution of this problem is that the number of boundary data sets needed to establish uniqueness is not known even under the restricted cases where uniqueness is proved theoretically. In this paper, we present a numerical technique that can assess the sufficiency of given boundary data sets by computing the rank of a sensitivity matrix that arises in the Gauss-Newton method used to solve the problem. Numerical experiments are presented to illustrate the method.

Item Type:	Journal Article
Publication:	Inverse Problems in Science and Engineering
Publisher:	Taylor and Francis Ltd
Additional Information:	Copyright of this article belongs to Taylor and Francis Ltd.
Keywords:	Inverse Problem; Elasticity; Sensitivity Matrix; Gauss-Newton Method; Boundary Data Sets
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	05 Mar 2013 08:15
Last Modified:	05 Mar 2013 08:15
URI:	http://eprints.iisc.ac.in/id/eprint/45413

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